1. USB charging interface, the charging method is more flexible, and the battery is charged independently.2. The LED screen accurately displays the battery status.3. With micro USB cable, easy to charge.4. The soft-start function can prevent damage from high charging current during charging.5. Small size, capital for business trips and family use, portable and easy to carry.6. Intelligent charging protection, automatic identification of the battery and intelligent charging to prevent overcharge, overdischarge, overvoltage, high temperature short circuit.7. Suitable for Nikon D30/D50/D70/D70S/D90/D80/D100/D200/D300/D300S/D700

http://olla.gr/for-nikon-en-el3e-el3-smart-lcd-display-usb-dual-channel-charger/